If you search for "Harry Potter Deathly Hallows" on google maps then you will find my approximate locations. If I were the film producers I would have filmed in the quieter bit of the forest across the busy road.

If you are visiting then park at the Lookout Discovery Centre.
(It is actually a good place to visit with children anyway)
You can hire a bike there or pay a £2 permit for your own bike.
The Look Out Discovery Centre